“Researchers at Microsoft have observed two separate advanced persistent threat (APT) actors that leveraged the same Flash Player zero-day vulnerability to spy on Turkish citizens living in Turkey and various other European countries.
Dubbed by Microsoft PROMETHIUM and NEODYMIUM – the company assigns chemical element names to threat actors – the groups used different infrastructure and malware, but there are some similarities that indicate a possible connection at a higher organizational level.
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Source: Two APTs Used Same Zero-Day to Target Individuals in Europe | SecurityWeek.Com